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鱼场发生大规模鱼死现象,有时甚至是全军覆灭性鱼死,鱼死前正常,没有明显的症状,但突然大规模死亡。
Large-scale fish killings occurred in fish farms, and sometimes the entire army died of dead fish. The fish were normal before death, with no obvious symptoms but suddenly died on a large scale.